Let's take Hatsune Miku. You could argue that "she" fits the bill (3D character, algorithmic voice, lots of followers), but of course there are humans writing those songs and music. If you automated that away (AI lyrics, AI music) you would still have humans checking that the music fits "her" style, that the lyrics make sense, and that the result is not just a racist tirade due to 4chan training data. And as long as those humans are there you can't really say it's 100% AI, can you?
One could argue (wrongly, IMHO) that doing the selection and filtering is not the same as making music, but that criteria would then classify DJs as "not musicians" and I know they hate that.